CN107155233B - Anti-dazzle headlight - Google Patents

Anti-dazzle headlight Download PDF

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Publication number
CN107155233B
CN107155233B CN201710120478.1A CN201710120478A CN107155233B CN 107155233 B CN107155233 B CN 107155233B CN 201710120478 A CN201710120478 A CN 201710120478A CN 107155233 B CN107155233 B CN 107155233B
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China
Prior art keywords
headlight
light
light source
emitting diode
matrix array
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CN201710120478.1A
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CN107155233A (en
Inventor
安托万·德拉姆勃特力
萨米拉·姆巴塔
桂拉姆·辛
欧李维亚-赛伯斯坦·雷瑟弗瑞
托马斯·卡侬
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Valeo Vision SAS
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Valeo Vision SAS
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/65—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
    • F21S41/657—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by moving light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/30—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by reflectors
    • F21S41/32—Optical layout thereof
    • F21S41/36—Combinations of two or more separate reflectors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/0017—Devices integrating an element dedicated to another function
    • B60Q1/0023—Devices integrating an element dedicated to another function the element being a sensor, e.g. distance sensor, camera
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
    • B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
    • B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
    • B60Q1/06—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights adjustable, e.g. remotely-controlled from inside vehicle
    • B60Q1/08—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights adjustable, e.g. remotely-controlled from inside vehicle automatically
    • B60Q1/085—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights adjustable, e.g. remotely-controlled from inside vehicle automatically due to special conditions, e.g. adverse weather, type of road, badly illuminated road signs or potential dangers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
    • B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
    • B60Q1/14—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights having dimming means
    • B60Q1/1415—Dimming circuits
    • B60Q1/1423—Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/10—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source
    • F21S41/14—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by the light source characterised by the type of light source
    • F21S41/141—Light emitting diodes [LED]
    • F21S41/151—Light emitting diodes [LED] arranged in one or more lines
    • F21S41/153—Light emitting diodes [LED] arranged in one or more lines arranged in a matrix
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/20—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by refractors, transparent cover plates, light guides or filters
    • F21S41/285—Refractors, transparent cover plates, light guides or filters not provided in groups F21S41/24-F21S41/28
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/40—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by screens, non-reflecting members, light-shielding members or fixed shades
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/65—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources
    • F21S41/663—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on light sources by switching light sources
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S41/00—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps
    • F21S41/60—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution
    • F21S41/67—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors
    • F21S41/675—Illuminating devices specially adapted for vehicle exteriors, e.g. headlamps characterised by a variable light distribution by acting on reflectors by moving reflectors
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/97—Determining parameters from multiple pictures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/15—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components with at least one potential-jump barrier or surface barrier specially adapted for light emission
    • H01L27/153—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components with at least one potential-jump barrier or surface barrier specially adapted for light emission in a repetitive configuration, e.g. LED bars
    • H01L27/156—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components with at least one potential-jump barrier or surface barrier specially adapted for light emission in a repetitive configuration, e.g. LED bars two-dimensional arrays
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/10—Controlling the intensity of the light
    • H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/30—Driver circuits
    • H05B45/37—Converter circuits
    • H05B45/3725—Switched mode power supply [SMPS]
    • H05B45/375—Switched mode power supply [SMPS] using buck topology
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
    • H05B47/10—Controlling the light source
    • H05B47/105—Controlling the light source in response to determined parameters
    • H05B47/115—Controlling the light source in response to determined parameters by determining the presence or movement of objects or living beings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q1/00—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor
    • B60Q1/02—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments
    • B60Q1/04—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights
    • B60Q1/14—Arrangement of optical signalling or lighting devices, the mounting or supporting thereof or circuits therefor the devices being primarily intended to illuminate the way ahead or to illuminate other areas of way or environments the devices being headlights having dimming means
    • B60Q1/1415—Dimming circuits
    • B60Q1/1423—Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic
    • B60Q1/143—Automatic dimming circuits, i.e. switching between high beam and low beam due to change of ambient light or light level in road traffic combined with another condition, e.g. using vehicle recognition from camera images or activation of wipers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q2300/00—Indexing codes for automatically adjustable headlamps or automatically dimmable headlamps
    • B60Q2300/05—Special features for controlling or switching of the light beam
    • B60Q2300/056—Special anti-blinding beams, e.g. a standard beam is chopped or moved in order not to blind
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q2300/00—Indexing codes for automatically adjustable headlamps or automatically dimmable headlamps
    • B60Q2300/30—Indexing codes relating to the vehicle environment
    • B60Q2300/31—Atmospheric conditions
    • B60Q2300/312—Adverse weather
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q2400/00—Special features or arrangements of exterior signal lamps for vehicles
    • B60Q2400/20—Multi-color single source or LED matrix, e.g. yellow blinker and red brake lamp generated by single lamp
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21W—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO USES OR APPLICATIONS OF LIGHTING DEVICES OR SYSTEMS
    • F21W2102/00—Exterior vehicle lighting devices for illuminating purposes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2105/00—Planar light sources
    • F21Y2105/10—Planar light sources comprising a two-dimensional array of point-like light-generating elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
    • F21Y2115/00—Light-generating elements of semiconductor light sources
    • F21Y2115/10—Light-emitting diodes [LED]
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
    • H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
    • H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
    • H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
    • H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Computer Hardware Design (AREA)
  • Mathematical Physics (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Theoretical Computer Science (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)

Abstract

The present disclosure proposes a vehicle headlamp comprising at least one light emitting diode, wherein the at least one light emitting diode is configured to operate as a detector of a light source.

Description

Anti-dazzle headlight
Technical Field
The present invention relates to the field of vehicle headlights, in particular headlights that allow a reduction in the glare experienced by the driver.
Background
It has long been known that light beams emitted by headlamps, such as low beams or high beams, can dazzle the driver because the light beams can reflect from elements of the scene illuminated by the headlamps. Fig. 1 illustrates this problem. Illuminated elements of a scene that are prone to reflect light include in particular natural elements such as raindrops or snowflakes. Furthermore, during periods of poor weather, the visibility of the driver is not satisfactory because of the multiple reflections of the light emitted by the driver's vehicle.
A known device for overcoming this problem is shown in figure 2. The device comprises a camera which detects raindrops and the light beams of the two headlights/headlights are changed so that the detected raindrops are no longer illuminated. However, this solution is not effective because the means implemented by this solution do not allow analysis to be carried out in a sufficiently short time and therefore the correction for the headlights is no longer valid when carried out.
It is an object of the present invention to provide a solution that alleviates or overcomes these drawbacks. More specifically, the present invention aims to provide a device and a method for detecting and masking the reflective elements of a scene illuminated by a headlight, which are simple and effective and allow a rapid correction of the illumination of said scene.
Disclosure of Invention
To this end, the invention proposes a vehicle headlamp comprising at least one light-emitting diode configured to operate as a detector of a light source. In this way, the physical properties of the diode are exploited not only for emitting light, but also for converting light into a current (or voltage). Thus, the detection of raindrops no longer depends on the use of a camera, but uses at least one diode of the headlight.
The headlight may further include:
adapted to be coupled to a control unit configured to operate the at least one light emitting diode alternately as a detector and a light emitter of a light source;
the control unit is further configured to transmit a synchronization signal indicating whether the at least one light emitting diode operates as a light emitter or a detector of the light source;
the control unit is further configured to alternate operation of the at least one light emitting diode upon receiving a synchronization signal;
a first memory that records whether the at least one light emitting diode detected a light source when the at least one light emitting diode was recently operated as a detector of the light source; and a second memory which records whether the at least one light emitting diode detects the light source when the at least one light emitting diode is operated at a time immediately before the detector as the light source;
a calculation unit that calculates a speed and a direction of the movement of the detected light source by comparing records of the first memory and the second memory;
a diode matrix array comprising the at least one light emitting diode;
a matrix array of mirrors that reflect light sources emitted or detected by the at least one light emitting diode of the matrix array;
all diodes of the matrix array operate alternately as light emitters and as detectors of one or more light sources;
a matrix array of mirrors that reflect light sources emitted or detected by the at least one light emitting diode, the mirrors of the matrix array being configured such that only a single mirror can reflect light sources towards the at least one light emitting diode.
The invention also proposes an illumination device according to the invention comprising at least two headlights.
The apparatus may further comprise:
the at least one diode of the first headlight is configured to operate (i) as a light emitter when the at least one diode of the second headlight is configured as a detector of the light source, and (ii) as a detector of the light source when the at least one diode of the second headlight is configured as a light emitter;
each headlight comprises control units connected to each other such that the synchronization signal transmitted by the control unit of one headlight is received by the control unit of another headlight;
at least two headlights are coupled to a control unit that transmits synchronization signals to the headlights;
each headlight comprises a calculation unit;
the at least two headlamps are also configured to emit light simultaneously.
A method for detecting and shielding a light source is also presented; the method is performed with the above-described irradiation apparatus. The method comprises the following steps:
transmitting a first synchronization signal;
after the first synchronization signal has been transmitted:
emitting light with the at least one diode of the second headlamp; and is
Operating the at least one diode of the first headlight as a detector of the light source;
recording in a first memory of a first headlight whether the at least one diode of the first headlight detects a light source;
transmitting a second synchronization signal;
after the second synchronization signal has been transmitted:
emitting light with the at least one diode of the first headlamp; and is
Operating the at least one diode of the first headlight as a detector of the light source;
recording in a first memory of the second headlight whether the at least one diode of the second headlight detects a light source.
The method may further comprise repeating those steps of the method wherein the step of recording to the second memory of the first headlight or the second headlight is performed, and may further comprise the steps of:
calculating, with a calculation unit, after recording in the second memory of the first headlight, the speed and direction of movement of the light source detected by the first headlight, and determining, from said calculation, the light-emitting diodes of the matrix array of the first projector;
after recording in a second memory of the second headlight, calculating with a calculation unit the speed and direction of movement of the light source detected by the second headlight and determining from said calculation the diodes of the matrix array of the second headlight which are allowed to emit light;
transmitting a third synchronization signal;
after the third synchronization signal has been transmitted, the first headlight and the second headlight are configured such that they emit light simultaneously, only those diodes which are determined to be allowed to emit light being activated.
A method for detecting and shielding a light source with the above-described illumination device is also proposed, wherein each headlight comprises a calculation unit. The method comprises transmitting a first synchronization signal of a first headlight (referred to as a master headlight) according to the invention to a second headlight (referred to as a slave headlight) according to the invention. The at least one diode of the matrix array of second headlights is illuminated after the first synchronization signal is received by the second headlights, and the at least one diode of the first headlights operates as a detector of the light source after the first synchronization signal has been transmitted. The first headlight records in its first memory whether the at least one diode of the first headlight detects a light source. The second synchronization signal is transmitted by the first headlight to the second headlight. The at least one diode of the first headlight is illuminated after the second synchronization signal has been transmitted, and the at least one diode of the second headlight is operated as a detector of the light source after the second signal has been received. The second headlight records in its first memory whether the at least one diode of the second headlight detects a light source.
Drawings
Other features and advantages of the invention will become apparent upon reading the following detailed description of the invention, given by way of example and with reference to the accompanying drawings, in which:
figures 1 and 2 show an example of a known prior art system of headlights;
fig. 3a shows a schematic view of an exemplary headlight according to the invention;
fig. 3b shows a schematic view of another exemplary headlight according to the invention;
fig. 3c shows a schematic view of another exemplary headlight according to the invention;
figure 4 shows an example of the operation of the device according to the invention;
fig. 5 shows an exemplary matrix array of diodes that can be used with a headlamp according to the invention;
fig. 6 shows a detailed view of the sub-matrix array of fig. 5;
figure 7 shows an exemplary control unit of a projector according to the invention;
fig. 8 shows an exemplary functional block diagram of a device using the detection and masking method according to the present invention;
figures 9a, 9b and 9c show examples of matrix arrays of diodes;
fig. 10a and 10b show an exemplary configuration of the device according to the invention.
Detailed Description
With reference to fig. 3a,3b,3c, three exemplary headlights according to the invention will now be described. The headlights may be the headlights of a land vehicle, for example, the headlights of a motor vehicle. The headlights may independently be the left or right headlights of an automobile; such as a left or right headlight (where light reflection problems are particularly disturbing). The headlight comprises at least one Light Emitting Diode (LED). Hereinafter, the terms LED and diode denote the same thing.
In the example of fig. 3a, the headlight comprises a matrix array 30a of LEDs, wherein at least one LED of the matrix array is configured to operate as a detector of the light source. The detected light source is a light source entering the headlight; in other words, the light source detected by the headlight is positioned outside the headlight. The term LED matrix array (also known by the french term "grille de DEL" or LED grid/grating) denotes an array of a plurality of LEDs arranged in a pattern that may be regular. These arrays allow for the replacement of incandescent or fluorescent lights of the illuminating device, similar to traffic lights, brake lights, indicators and visible devices that motor vehicles are configured for safety reasons.
In the example of fig. 3b, in addition to the LED matrix array 30b, the headlight comprises a matrix array of reflectors 34, which reflect light emitted by the LEDs of the matrix array 30b, or even reflect light emitted by the light source (external to the headlight) towards at least one light emitting diode of the matrix array. The term "matrix array of mirrors" (such a matrix is also referred to by the term "Digital Micromirror Device (DMD)") refers to a micro-electromechanical system that allows a (optionally pixilated) light source to project onto a micro-mirror. Each mirror can assume two positions: each mirror may be tilted along the same axis to reflect light towards the system of lenses 32 or towards the surface of the LED matrix array 30 b. Each micro-mirror is switched (or tilted) to two different positions, referred to as "on" or "off positions. Each LED of the matrix array is associated with a portion of the matrix array of reflectors.
Referring again to fig. 3b, the number of LEDs of the matrix array 30b and the number of mirrors of the matrix array 34 may be equal, such that a single or more mirrors reflect light emitted or received by a single LED of the matrix array. The problem is therefore the specular (reflective) correlation between one LED and multiple mirrors. The number of LEDs of matrix array 30b may be less than the number of mirrors of matrix array 34, such that light emitted by one LED is reflected by one or more mirrors, and light received by one LED (configured to act as a detector of the light source) is reflected by a plurality of mirrors. In this particular case, the relationship between the LEDs and the mirrors is such that the N mirrors of the matrix array form a set of mirrors associated with a single LED; preferably, the mirrors of the set all have the same position (all "on" or even all "off"). Finally, the number of LEDs of matrix array 30b may be greater than the number of mirrors of matrix array 34, such that light emitted by a plurality of LEDs is reflected by a single mirror, and light received by a plurality of LEDs (configured to operate as a detector of a light source) is reflected by one mirror. The relationship between the LEDs and the reflector is such that N LEDs of the matrix array form one LED group and are associated with a single reflector; preferably, a group of LEDs are all configured to operate as a detector of the light source or configured to operate as a light emitter.
In the example of fig. 3b, the headlight may further comprise an absorption surface 36, the absorption surface 36 limiting reflection of the light source into the headlight via a reflector, which is not positioned to reflect said light towards the LED matrix array 30 b.
In the example of fig. 3c, the headlight comprises one LED 30c, a matrix array of reflectors 34, said reflectors 34 reflecting light emitted by the LED 30c, or even reflecting light sources directed towards and entering the headlight via the LED 30 c. When the LEDs emit light, the mirrors of the matrix array are positioned such that the emitted light is transmitted towards the system of lenses 32. Thus, the mirrors may be positioned to form an image and redirect the image toward the system of lenses 32.
Again in the example shown in fig. 3c, when the LEDs are configured to operate as detectors of light sources, the mirrors of the matrix array are configured such that a single mirror of the matrix array 34 is able to reflect the light source that must be detected by the LED 30 c. Thus, when the LEDs are configured to operate as detectors of the light source, each mirror of the matrix array is placed in succession at a position that allows light to be redirected from the light source to the LEDs. The other mirrors of the matrix array (i.e. all mirrors except at the positions where light is allowed to be redirected from the light source to the LEDs) are at positions where the light of the light source is not reflected towards the LEDs. The headlight may further comprise an absorption surface 36, the absorption surface 36 limiting reflection of said light source into the headlight via a reflector, which is not positioned to reflect light towards the LEDs 30 c.
The example in fig. 3a is the simplest to implement in three examples, since the LED matrix array illuminates and detects directly. The example in fig. 3b allows in particular a LED matrix array with a plurality of LEDs which are smaller than the LEDs used in fig. 3a, while maintaining a similar granularity of detection as in fig. 3 a; the management of the LED matrix array is simplified and the acquisition of the image of the scene (and the light source of the scene) is faster. The example in fig. 3c allows a single LED to be used as a light emitter/light detector, thereby facilitating management of the LEDs (e.g., only a single ASIC is required) and reducing the manufacturing cost of the headlamp.
In the present invention, at least one LED is used as a light source, i.e. one or more LEDs emit light (photons) under the influence of a voltage applied at the P-N junction of the LED. At least one LED comprised in the headlight also serves as a detector for the light source, i.e. photons emitted by the light source are captured at the same height as one or more LEDs of the matrix array, which as a result generates an electrical current. The physical properties of the LEDs are thus used to (alternately) emit light and to detect the light emitted by elements of the scene. A scene is a space that has to be illuminated by headlights, i.e. at least some space that has to be made visible to, for example, the driver of a vehicle. It will be appreciated that the scene may change, for example, as the vehicle moves. Forming a light source from light emitted by elements of a scene; for example, raindrops are an element of a scene that reflects light and thus forms a light source. The light source of the scene is thus outside the headlight.
Fig. 5 and 6 show an exemplary configuration of a LED matrix array that may be used with the examples of fig. 3a and 3 b.
In the example of fig. 5, the matrix array consists of an LED array assembly (or LED sub-matrix), the LEDs of which are aligned in two rows 510, 512 or sub-matrix arrays 50, and thus form a sub-matrix array grid 50 arranged on a carrier 60 (also referred to as substrate 60). Each sub-matrix array 50 includes an Application Specific Integrated Circuit (ASIC) configured to manage the LEDs of each sub-matrix array. The management particularly includes the configuration of one or more LEDs of the sub-matrix array to emit light or even as photodetectors. It will be appreciated that the ASIC may manage one or more sub-matrix arrays, as will be discussed below with reference to fig. 9 a.
The centralized management of the sub-matrix arrays is achieved using a control unit 54, which control unit 54 may be a Field Programmable Gate Array (FPGA) communicating with the ASICs of each sub-matrix array by means of buses 1560, 1562, 1564, 1566, the buses 1560, 1562, 1564, 1566 being respectively buses 1560 for transmitting/receiving data to/from the ASICs of the sub-matrix array, an address bus 1562 selecting the ASIC in communication therewith, a bus 1564 for triggering the state of the sub-matrix array and a bus 1566 for reading/writing from/to the ASICs of the sub-matrix array. The control unit may be connected to a video source, e.g. a video camera, via a dedicated video interface, e.g. HDMI (high definition multimedia interface) or even DVI (digital visual interface). This allows the control unit to reconfigure the LED matrix array in accordance with the received video signal. The video source may also be provided by an Advanced Driver Assistance System (ADAS) known in the art.
Each sub-matrix array is powered by a voltage converter 52, the voltage converter 52 converting the voltage of the feed line 514 to a low voltage. The voltage converter may be a BUCK converter. The voltage converter allows the ASIC of each LED sub-matrix array to be powered. Each sub-matrix array is also powered by a second feeding line 512 having a voltage different from that of the first line. For example, the second line transmits the current required by the LEDs of each sub-matrix array so that it can illuminate the scene (i.e. emit light).
Fig. 6 shows a detailed example of the sub-matrix array 50. Each sub-matrix array comprises a plurality of LEDs mounted in parallel, and each LED is individually/separately driven by a power supply 502. The management of the LEDs of the sub-matrix array is ensured by the ASIC 504, the ASIC 504 comprising in particular functions for managing the bus, power supply, temperature and for detecting LED problems.
It will be appreciated that the examples of fig. 5 and 6 may vary according to the technology of the LED matrix array or even according to the technology selection, as shown in fig. 9a, 9b and 9 c. For example, the matrix array may not consist of a sub-matrix array and comprises only one matrix array of LEDs, wherein each LED may optionally serve as a light sensor and a light emitter.
Fig. 9a, 9b and 9c show other examples of LED matrix arrays. Fig. 9a shows an example similar to that described with reference to fig. 5, except that one ASIC manages a plurality of sub-matrix arrays. It will be understood that one ASIC may also manage a plurality of individual LEDs assembled together to form a LED matrix array. Fig. 9b shows an example in which the matrix array does not comprise a sub-matrix array but only a single matrix array. Still in this example, the ASIC (controlling the LED matrix array) is positioned between the carrier 60 and the LED matrix array. Fig. 9c shows an example similar to fig. 9b, but in this example both the ASIC and the LED matrix array are positioned directly on the carrier 60.
Returning to fig. 3a, the LED matrix array is arranged on an ASIC such that the semiconductor is placed on a connection land arranged in a preselected configuration and positioned on an insulating carrier element comprising the ASIC controlling the array of P-N junctions of the LEDs.
In fig. 3b, the LED matrix array 30b is positioned as a matrix array itself positioned on a carrier 60 to illuminate the reflector 34.
In fig. 3b, the LEDs 30c are positioned to illuminate a matrix array of the reflector 34 that is itself positioned on the carrier 60.
The headlight of fig. 3a,3b,3c may be adapted to be coupled to a control unit configuring the operation of the one or more LEDs. The control unit may be, for example, an FPGA 54 shown in fig. 5 and 6. The control unit may configure the one or more LEDs such that they emit light, i.e. the control unit controls the power supply of each diode separately. This control is implemented as in the prior art; for example, the FPGA sends commands to the ASIC via one or more buses, which in turn will set the LEDs that must emit light under voltage. The control unit may also receive information that one or more LEDs have detected a light source: the control unit may read the current generated by the LED that has detected the light source. In practice, the ASICs of the sub-matrix array associated with the LEDs that have detected the light source send information to the control unit via one or more buses, and the control unit is configured to identify the LEDs. The control unit may thus instruct the operation of each LED separately (alternately as a light emitter or even as a detector of the light source), and the control unit is further configured to determine which, if any, LEDs have detected the light source. It will be appreciated that the change from one mode of operation to another may occur in a LED that emits light or even an LED that acts as a detector.
The control unit is connected to the headlights using conventional mechanisms (e.g., circuitry). The headlight according to the invention may comprise a control unit.
The control unit may also transmit a synchronization signal for synchronizing the operation of the first headlight with the operation of the second headlight according to the invention. The synchronization signal indicates what the operating mode of the one or more LEDs controlled by the control unit is. The synchronization signal is typically a synchronization pulse; for example rectangular electrical signals of preset height and preset width, or even commands on a communication bus such as a CAN (controller area network), ethernet, CAN FD (flexible data rate) or FlexRay bus. The synchronization signal is transmitted from the control unit to the second headlight using a bus (which may be dedicated to this function or vice versa), it being understood that the bus may be, but is not limited to, a physical link (e.g. an electrical wire) or even wireless (e.g. wireless)
Figure BDA0001236850170000091
) And (4) connecting. In fact, the bus may be a physical link, which results in better propagation speed and better assurance of good transmission of the synchronization signal.
The control unit may also change the operation of one or more LEDs upon receiving the synchronization signal. Thus, upon receiving an external signal, the control unit may trigger the emission of light by one or more LEDs, or even trigger the operation of one or more LEDs as a detector of the light source. The received synchronization signal is transmitted using a mechanism similar to that used to transmit the synchronization signal.
The control unit may be configured to only send synchronization signals, or even to only receive synchronization signals, or even to send and receive synchronization signals. In practice, the control unit is configured to send and receive synchronization signals, as this facilitates the assembly and configuration of the device using at least two headlights according to the invention, for example as described below with reference to fig. 4.
The transmission and/or reception of the synchronization signals may be managed by a synchronization subunit which itself is managed by the control unit.
The control unit may also comprise a video input allowing the control unit to reconfigure/reconfigure the LED matrix array of fig. 3a and 3b or even the matrix array of mirrors of fig. 3b and 3c in dependence of the received video signal. For example, if the camera detects (the camera takes) that the vehicle is travelling towards a vehicle equipped with a headlight according to the invention, the control unit may command one or more LEDs of the matrix array of fig. 3a and 3b to be turned off so as not to illuminate the approaching vehicle, or even so as not to illuminate a part of the approaching vehicle (e.g. the windscreen); or the control unit may even instruct the position of one of the mirrors of fig. 3b and 3c so that they do not reflect the light emitted by the LED matrix array 30b or the LEDs 30c in a direction approaching the vehicle or even in a direction approaching a part of the vehicle, e.g. the windscreen. After receiving the video signal by implementing known mechanisms for shielding the headlamp light sources or known mechanisms for managing the position of the reflector, one or more LEDs may be shielded, or one or more reflectors positioned. The control unit may also be used to send information to other road users, for example to warn them of crosswalks, danger, etc.
The headlight of fig. 3a,3b and 3c may also comprise a system of lenses 32 allowing to vary the lighting of the LEDs. LED lenses are frequently used to increase the angle of light and thus the illumination field of view (FoV).
The control unit of fig. 3a and 3b may have at least one memory allowing it to record which LED has detected the light source. The memory may store a table, wherein each bin of the table is associated with a single LED of the matrix array, and the value stored in the bin represents that the LE has detected a light source (the value is for example "1") or has not detected a light source (the value is for example "0"). Other methods of recording the detected light source are contemplated. For example, the memory can store additional information, not just information about whether a light source has been detected. As another example, the memory can store the value of the detected luminous flux (the current generated by the LEDs varies in proportion to the amount of light detected), or even the type of light-emitting object that has been detected (e.g. raindrops, puddles, road signs, etc.).
The control unit of fig. 3c may have at least one memory allowing it to record which mirrors are in a position allowing light to be reflected towards the LEDs when the mirrors are already in that position, the LEDs 30c having detected a light source for the LEDs. The memory may store a table, wherein each bin of the table is associated with a single mirror of the matrix array, and the values stored in the bins indicate whether the LED has detected a light source when the mirror is at a position that allows the light source to be reflected towards the LED. It will be appreciated that the exemplary method of storing discussed with reference to figures 3a and 3b may be adapted to the control unit of figure 3 c. The control unit may comprise two memories. When one or more LEDs have recently operated as a detector of the light source with respect to the time at which the recording was made, the first memory records (or even stores) which LEDs of the matrix array detected the light source or which mirrors reflected the light source towards the LEDs. When the LEDs operate as detectors of the light source at a time immediately preceding the time the recording was made, the second memory records (or even stores) which LEDs of the matrix array detected the light source or which mirrors reflected the light source towards the LEDs. The time before one or more LEDs have recently operated as a detector of the light source should be understood to mean the time followed by the operations as light emitter and detector of the light source. The first memory thus contains the results of recent probes and the second memory contains the results of prior probes. When a new detection result is read (or obtained, as it were) by the control unit, the two memories can be managed as follows: the results stored in the first memory are transferred to a second memory, which replaces the old results with the results transferred thereto; after this, the new detection result is recorded to the first memory.
Optionally, the new probe result is written to overwrite the result contained in the memory storing the oldest result. It will be understood that, in this modified example, the first memory is no longer limited to a memory including recent detection results. This makes it possible to avoid transferring data between the two memories, which may be expensive, but requires the control unit to know which of the two memories comprises the oldest detection result. It will be appreciated that the way the memory is managed (in particular with respect to writing/reading/deleting of data stored therein) may depend/depend on the type of memory, and/or its technology and/or control unit.
The control unit may further include a calculation unit that calculates a speed of the detected movement of the light source and a direction of the movement by comparing the records of the first memory and the second memory. The comparison of the data stored in the two memories allows to determine, in each new detection cycle of the LED, a new position of the previously detected light source. The number of detected light sources may be high; generally, when the element reflecting light of the headlights of the vehicle is raindrops (in this case, each raindrop is considered as a light source), an assumption indicating the statistically measured behavior of the reflecting element (e.g., raindrop) may be used; these assumptions allow the most likely position of the raindrop between two detections to be determined in order to eliminate some motion that may be measured during the comparison of the data of the two memories.
For example, the speed of movement of the raindrops can be calculated by correlating two images acquired at two different times using an image correlation (cross-correlation or global correlation) software package, such as those used to measure deformation of matter (material strength). Here, the term "image" means a record in one of the memories of the detection results of the LEDs of the matrix array, or of those mirrors of the light source for which the LEDs detect when said mirrors are at a position allowing the light source to be reflected towards the LEDs. The image (stored in one of the memories of the headlights) represents a scene in which one or more detected light sources of the scene have a different view than the rest of the scene. Cintr Yuan, V.Saouma, 2008 document "stress measurement with Digital Image Correlation System Vic-2D using Digital Image Correlation System Vic-2D" describes an example of a Correlation method applied to point deformation Measurements during deformation of a substance under stress. Other methods may be used, for example based on an Iterative Least Squares (ILS) algorithm or even a point-by-Point Least Squares (PLS) algorithm.
In addition, the calculations that allow determining the new position of the previously detected light source may take into account external factors of the measurements made by the headlight. These external factors may for example be the speed of movement of the vehicle (the control unit may be configured to receive information relating to the speed of the vehicle in real time). Another exemplary external factor is information contained in the video signal received by the control unit. The on-board camera may allow the detected light sources to be grouped according to one or more criteria such as, for example, their source (raindrops, headlights of oncoming vehicles), in order to apply different assumptions representing the statistically measured behavior to each group.
Fig. 7 shows an example of a control unit 54 of a headlamp according to the present invention. The control unit 54 comprises a synchronization unit 700, the synchronization unit 700 allowing synchronization signals to be transmitted, for example, via a cable 704. The control unit may be associated with a timer 702, for example making it possible to set when the speed and direction of movement of the light source have to be calculated by means of, for example, the calculation unit 710; or even make it possible to set when the cover is used on the headlight, as explained below. The calculation unit 710 is further connected to a first memory 720 and a second memory, to which new probe results (these results are referred to as N) are recorded to the first memory 720 and previous probe results (these results are referred to as N-1) are recorded to the second memory. The new probe results may be filtered by the filtering unit 730 before being recorded. Filtering may, for example, include generating groups of light sources based on their source. The output of the calculation unit may be connected to a calculation correction unit 740, the calculation correction unit 740 being responsible for applying a correction to the result transmitted by the calculation unit in dependence on external factors, such as discussed above. From the output of the calculation unit 710, or, if appropriate, the calculation correction unit 740, a mask calculation unit 750 determines which LEDs of the matrix array or even which mirrors of the matrix array will allow to contribute to the illumination of the scene. In the case of this object, the mask calculation unit calculates a mask that can be applied to the LED matrix array or the matrix array. In a matrix array of LEDs or mirrors, the cover allows a subset/subset of the LEDs to be activated to emit light, or a subset/subset of the mirrors to be positioned to reflect light emitted by at least one LED, or, in contrast, to be deactivated, i.e. deactivated, or a subset/subset of the mirrors to be positioned so as not to reflect light emitted by at least one LED. Selection of an LED to be activated or a mirror to be placed at a set position is made in accordance with data transmitted by the calculation unit 710 or the calculation correction unit 740; the calculation of the cover includes applying to each of the most recently detected light sources (i.e., to the record of memory 720) the speed and direction of movement calculated by unit 710 or 740 (as appropriate).
Thus, the image stored in the second memory is changed according to the detected motion prediction of the light source, and this changed image is used as a mask allowing to mask one or more spaces of the scene. The cover serves to prevent one or more LEDs of the headlight from illuminating an area of the scene that includes elements that tend to reflect light emitted by the headlight and thus tend to dazzle the driver of the vehicle. The cover is thus a grid, each cell of which corresponds to a matrix array of LEDs or even a matrix array of mirrors. The cells of the grid correspond to future positions calculated for elements liable to reflect the light emitted by the headlight, these positions calculated for a preset period of headlight activation being the cells for which the corresponding LED is not switched on or for which the corresponding reflector is not positioned to reflect the light of the LED when the headlight is lit. Therefore, these elements, which are liable to reflect light, will not reflect light emitted by the headlight.
The cover may furthermore be calculated such that additional areas of the scene, other than those comprising elements liable to reflect the light emitted by the headlights, are not illuminated. For example, the mask computing unit 750 may be connected to a video source (e.g., a video camera) via a dedicated video interface as described above. The mask calculation unit interprets the received video information and determines the non-illuminated areas of the scene. Known mechanisms and algorithms may be used for this purpose. For example, a simple method may be to add the calculated mask to the image transmitted by the video source.
Fig. 4 depicts an example of an apparatus for illuminating a scene comprising two headlights according to the example of fig. 3 a. In this example, the headlights are headlights of an automobile, which detect the speed and direction of movement of the raindrops and vary the illumination they provide in accordance with the detection results to reduce reflections of the headlights of the automobile from the raindrops. The device may also be applied to lights positioned at the rear of the vehicle in order to optimize the photographs taken by, for example, a rear camera. Each of the two headlights comprises a control unit, which configures the operation of the LEDs of its matrix array and allows the synchronization signals to be transmitted and received, and two memories, which allow the recording of the detection results thereof. The arrangement comprises a first headlight 402, the first headlight 402 being called dominant headlight, because the first headlight 402 is a control unit of the headlight 402, which control unit sends a synchronization signal indicating that the second headlight 404 has to emit light or even detect a light source. The second headlight is referred to as a slave headlight because the second headlight changes the operation mode only after the second headlight has received the synchronization signal. In this example, all LEDs of the matrix array of the headlight use the same mode of operation. Thus, as shown in the arrangement 40, when all LEDs of the matrix array of the master headlight 402 are operated as detectors, all LEDs of the slave headlight 404 emit light. Conversely 42, after the leading headlamp has transmitted the synchronization signal, all LEDs of the leading headlamp are illuminated, and all LEDs of the slave headlamps detect the light source (i.e., reflect light emitted by the leading headlamp and form raindrops of the light source). The two headlights are connected via a bus on which the synchronization signal is transmitted, for example a cable (or wire) dedicated to the synchronization of the two headlights.
An example of the cooperation between the master headlight and the slave headlights and the internal operation of each headlight will now be described with reference to the functional block diagram in fig. 8.
In step S10, two headlights are lit, typically the road and its edges; they are used, for example, as high beam or low beam. From the previous detection results, the matrix array of two headlights can have two configurations:
(i) if the last detection shows no light source, the LED of each headlight shines and illuminates the scene. Optionally, the number of LEDs may be reduced according to a preset scheme; for example, the headlights may be formed to operate as low beam headlights, which do not transmit the same illumination power as the same headlights operating as high beam headlights.
(ii) If the most recent detection shows a light source for one headlight and/or another headlight, the LEDs that emit light in each headlight are selected by means of a mask obtained from previous calculations of the speed and direction of movement of the previously detected light source.
When the synchronization information for synchronizing the master headlight with the slave headlights is transmitted, step S10 is triggered: once the synchronization has been transmitted, and once the signal has been received, the master headlight is illuminated and the slave headlights are illuminated. In practice, the transmission time of the synchronization signal is several milliseconds, so that the driver does not observe the changed opening of the two headlights.
In step S20, a timer is triggered. As the synchronization signal is transmitted in step S10, the timers may be triggered simultaneously. The timer is used to measure the amount of time that has elapsed. If the amount of time has not elapsed, both headlamps are maintained in an illumination mode, such as a high beam illumination mode. This time can be preset; for example, the measured duration may be comprised between 0.5 and 5 seconds, and preferably about 1 second. This time may be determined dynamically. For example, if the previous detection shows that very many raindrops act as a light source, this means that the rain is large, and therefore more repeated detections than usual are necessary.
Once the time has elapsed (S22), the master headlight transmits a synchronization signal to the slave headlights. This signal is interpreted by the control unit of the slave headlight as a command (S24) to turn on all the LEDs of its matrix array. The control unit of the slave headlight triggers (S32) the supply of current to all the LEDs it manages.
Immediately after reaching test S22, the main headlight performs two operations as follows.
The first operation comprises three successive sub-operations, namely: (i) operating all or some of the LEDs of the matrix array of leading headlights as detectors of light sources (S30); no longer causing any LEDs of the leading headlamp to emit light; (ii) reading (S34) from the matrix array of leading headlights, which are LEDs for which light sources have been detected, with the control unit of the leading headlight; (iii) sending a synchronization signal to the slave headlight, the synchronization signal being interpreted by the control unit of the slave headlight as a command (S36) to switch off (S60) all LEDs of the matrix array of the slave headlight: detection of a matrix array of leading headlights has been completed.
The second operation includes copying information contained in the first memory to the second memory (S40). The second memory then stores a record of the operation of the LED of the leading light at the most recent previous time.
In fact, these two operations start at the same time. It is contemplated to start them with a time shift (i.e., staggered start times), or even to execute them sequentially. It is preferable to make the copying S40 as fast as possible so that the result of the readout from step S34 is quickly recorded (S38) to the first memory of the leading lamp.
In step S50, the control unit of the leading headlamp calculates the hood, as discussed with reference to fig. 7.
In step S52, the control unit of the master headlight commands all the LEDs of the matrix array to be turned on, and the LEDs remain on until the master headlight receives the synchronization signal transmitted by the slave headlights.
After step 36, i.e., after the slave headlight has received the synchronization signal interpreted by the control unit of the slave headlight as a command to turn off all the LEDs (S36), the slave headlight performs the following two operations.
The first operation includes ceasing (S60) to operate all or some of the LEDs of the matrix array of the slave projector, which are no longer emitting light. The LED then operates as a detector of the light source.
The second operation includes copying the record contained in the first memory of the slave headlight to the second memory of the slave headlight (S70). The copying is complete and the second memory thus stores a record of the operation of the LED of the slave headlight at the most recent previous time. This step S70 is therefore similar to the step performed by the leading headlamp in step S40.
In fact, these two operations start at the same time. These two operations may be started with a certain time shift (i.e. with a staggered start time), or may even be performed sequentially. It is preferable to make the copying S70 as fast as possible so that the result of the readout from step S64 is quickly recorded (S68) to the first memory of the slave headlight.
Thus, after all LEDs have stopped, the control unit of the slave headlight reads the LEDs of the matrix array, which the control unit controls and determines (S64) which LEDs have detected the light source.
The result read by the control unit is recorded to a first memory (68). This step S68 is similar to the step performed by the main headlight in step S38.
Then, in step S80, the slave headlight performs the hood calculation in the same manner as the calculation performed in advance by the master headlight in step S50.
The readout of step S64 is terminated and the slave headlight sends a synchronization signal to the master headlight interpreting that the control unit of the slave headlight has terminated the readout of the LEDs of the matrix array operating as a detector.
Thus, the detection cycle has been completed and a road illumination cycle is now performed that takes into account the detection results.
Once step S80 ends, the timer activated in step S20 is zeroed. After resetting S90, two headlights are lighted and each headlight is applied with the cover calculated in steps S50 and S80, respectively (S10).
Once the time measured by the timer has elapsed (S20, S22), the new detection phase of the method is repeated for as long as the headlights of the vehicle have to illuminate the scene.
Elements of the scene, such as raindrops, that reflect light emitted by the headlights are thus detected in a local manner by each headlight, and the detection results are also utilized in a local manner by each headlight. In contrast to the case of solutions using a single camera not positioned in the headlights, no additional calculations are therefore necessary, the aim of which is to compensate for the difference in position between the position where the detection takes place and the position of the headlights. In addition, all operations that require calculation and preparation of data required for performing these calculations are performed by and for each headlight: there is no delay introduced, for example, by the data transmission, or at least the delay is reduced to local/local transmission in the headlights. Only the transmission of data to the headlights is a synchronous message transmission, which is not technically difficult to implement; the transmission of the synchronization messages is also extremely fast and can even be subject to such real-time constraints that: said real-time limitation allows a very fast operation of the device according to the invention, in particular with regard to detection. Furthermore, a single LED matrix array can in turn be used as detection and illumination means: the reduction in the number of components facilitates the integration of the functions required for detection and the reliability of the device according to the invention and the headlight.
Fig. 4 shows an example of timing steps of a method, such as the steps may be performed by an apparatus according to the invention. It should be noted that one or more steps of the method may be grouped together to be performed in a preset period. For example, in FIG. 4, data is read and the mask is calculated during a cycle of about 10 milliseconds duration, it being understood that the duration of the cycle varies according to criteria such as (but not limited to) the size of the matrix array, the computational power of the computational unit, and the like. Advantageously, each step of the method according to the invention belongs to one of the sequences, so that the method is performed in a preset time. The operation of the device according to the invention can thus meet real-time constraints. The illumination of the road is thus not affected by the detection and the safety of the vehicle is not impaired.
Variations of the method may be implemented. For example, in addition to the slave headlight transmitting a synchronization signal to the master headlight, once step S64 has terminated, the master headlight may transmit a synchronization signal to the slave headlight in step S66 to signal to the slave headlight that its matrix array of LEDs must be read out. In this case, the leading headlamp may include a timer that measures the time elapsed from the time when the leading headlamp transmits the synchronization signal after step S34, so as to leave a sufficient amount of time for the subordinate headlamp to detect the light source. In this variant, only the headlights manage the triggering of the plurality of steps.
When the detectors make their first detection, typically when the headlights of the car are required to turn on for the first time, the two memories do not contain information. The calculations of steps S50 and S80 must be performed for both memories to contain the results of the probing. Two detections (S22 to S80) may be performed consecutively in order to load two memories with the detection measurement values collected by the LEDs. The time of detection is on the order of tens of milliseconds, so that the driver does not observe any change/time shift between the command to turn on the headlights and the actual turning on of the headlights.
Fig. 4 and 8 are described with the headlight according to the example of fig. 3 a. It will be appreciated that the examples of fig. 3b and 3c do not change the described manner in which the master headlight and the slave headlights cooperate. In particular, the difference between fig. 3a,3b and 3c is the way light is emitted and received, for fig. 3a light is emitted and received directly, and for fig. 3b and 3c light is emitted and received indirectly. Thus, the way in which the light source emitted by the headlight (either directly from the LEDs of the matrix array or reflected by the reflector) is controlled is different. The example of fig. 3b is a "hybrid" mode comprising a matrix array of LEDs and a matrix array of mirrors. It will be appreciated that it is possible to calculate the shade using the position of the mirror and a series of diodes with detected light sources, and likewise the manner in which the shade is applied.
In the above example, the synchronization between the two headlights is referred to as the headlight of the "leading" headlight for guidance, i.e. the synchronization signal is transmitted by the leading headlight to the slave headlights, as shown in fig. 10 a. In practice, both headlights comprise a calculation unit. In another example, the synchronization between the two headlights is controlled by a control unit connected to both headlights, i.e. having one control unit common to both headlights, as shown in fig. 10 b. In this case, the two headlights are operated as slaves. It will be noted that in the latter case some elements that may be included in the control unit dedicated to each headlight are not implemented in a control unit common to both headlights. In particular, each headlight maintains its first and second memory and its calculation unit, so that the control unit can be used only to transmit synchronization signals and can comprise one or more timers in order to determine when to transmit synchronization signals. This makes it possible for the data collected by each headlamp not to have to be transmitted over a network, thereby allowing the calculations to be performed more quickly.

Claims (18)

1. A vehicle headlamp comprising at least one light-emitting diode (30a, 30b, 30c), wherein,
the at least one light emitting diode is configured to operate alternately as a detector of a light source to be detected by the headlight positioned outside the headlight and as a light emitter,
wherein the headlamp further comprises:
a first memory (720) that records whether the at least one light emitting diode detects a light source when the at least one light emitting diode is recently operated as a probe for the light source to be detected by the headlight that is positioned outside the headlight; and
a second memory (722) that records whether the at least one light emitting diode detects a light source when the at least one light emitting diode is operating at a time immediately before a detector positioned outside the headlight as the light source to be detected by the headlight.
2. The headlight of claim 1, adapted to be coupled to a control unit (54) configured to control said at least one light emitting diode to operate alternately as said detector of said light source to be detected by the headlight and as a light emitter positioned outside the headlight.
3. The headlamp of claim 2,
the control unit (54) is further configured to transmit a synchronization signal (700, 704) indicating whether the at least one light emitting diode operates as a light emitter or as a detector of a light source.
4. The headlamp of claim 3,
the control unit is further configured to alternate operation of the at least one light emitting diode upon receiving the synchronization signal.
5. The headlamp of claim 1, further comprising:
a calculation unit (710) that calculates a movement speed and a movement direction of the detected light source by comparing the records of the first memory and the second memory.
6. The headlamp of claim 1,
the diode matrix array comprises the at least one light emitting diode.
7. The headlamp of claim 6,
the matrix array of reflectors reflects light emitted by said at least one light emitting diode in said matrix array of diodes or light detected by said at least one light emitting diode in said matrix array of diodes from said light source positioned outside the headlight to be detected by the headlight.
8. The headlamp of claim 6,
all diodes of the matrix array operate alternately as light emitters and as detectors of one or more light sources to be detected by the headlight, each positioned outside the headlight.
9. The headlamp of claim 1,
the matrix array of mirrors reflects light emitted by the at least one light emitting diode or light detected by the at least one light emitting diode from the light source positioned outside the headlight to be detected by the headlight, the mirrors of the matrix array being configured such that only a single mirror is capable of reflecting the light source towards the at least one light emitting diode.
10. An illumination device (40, 42) comprising at least two headlights according to claim 1.
11. An illumination device (40, 42) comprising at least two headlights according to claim 4.
12. An illumination device (40, 42) comprising at least two headlights according to claim 5.
13. The illumination device of claim 11,
the control units are connected (704) to each other such that a synchronization signal transmitted by the control unit of one of the headlights is received by the control unit of the other headlight.
14. The illumination device of claim 11,
the at least two headlights are coupled to the control unit which transmits synchronization signals to the headlights.
15. The illumination device of claim 12,
each headlight comprises said calculation unit.
16. The illumination device of claim 10,
the at least two headlamps are also configured to emit light simultaneously.
17. A method for detecting and shielding a light source with an illumination device according to claim 15, comprising the steps of:
transmitting a first synchronization signal (S24);
after the first synchronization signal has been transmitted:
emitting light with the at least one light emitting diode of the second headlamp (S32); and
operating the at least one light emitting diode of the first headlight as a detector of the light source (S30, S34);
recording in a first memory of the first headlight whether the at least one light emitting diode of the first headlight detects the light source (S38);
transmitting a second synchronization signal (S36);
after the second synchronization signal has been transmitted:
emitting light with the at least one light emitting diode of the first headlight (S52); and
operating the at least one light emitting diode of the second headlight as a detector of the light source;
recording in a first memory of the second headlight whether the at least one light emitting diode of the second headlight detects the light source (S68).
18. The method of claim 17, further comprising:
repeating those steps of the method according to claim 17, wherein the step of recording to a second memory of the first headlight or the second headlight is performed; and is
Calculating, with the calculation unit, after recording in the second memory of the first headlight, the speed and direction of movement of the light source detected by the first headlight, and determining, from the calculation, the light-emitting-allowed diodes of the matrix array of the first projector (S50);
calculating, with the calculation unit, the speed and direction of movement of the light source detected by the second headlight after recording in the second memory of the second headlight, and determining, from the calculation, the light-emitting-allowed diodes of the matrix array of the second headlight (S70);
transmitting a third synchronization signal (S90);
after the third synchronization signal has been transmitted, the first headlight and the second headlight are configured to emit light simultaneously, only those diodes that are determined to be allowed to emit light being activated.
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